Here is a procedure and video on how to install ClockworkMod Recovery using fastboot on your Toshiba Folio 100.

Put your Folio 100 in Fastboot mode by pressing the [Power] button once, releasing it for a second while the tablet starts. When Toshiba logo appears, press 3 times [Power] button then one time [Volume+] button.

You can access ClockworkMod menu at any time by pressing [POWER] button for the tablet to start, when Toshiba logo appears, press simultaneously [POWER] and [VOLUME+] buttons to enter recovery mode.
Then push [VOLUME+] to continue the factory data reset or system update procedure
Then [VOLUME-] to continue system update
Then [VOLUME+] to confirm you want to continue and start the Recovery.

You will see a Booting kernel recovery image message and ClockworkMod Recovery V3.0.0.5 menu should appear after a second.